Convert host tools to Android.bp

See build/soong/README.md for more information.

Test: m libinstrumentation interrupter accessorychat accessorytest bit obbtool pbkdf2gen libsplit-select_tests split-select protoc-gen-javastream validatekeymaps libaapt_tests aapt
Test: mmma frameworks/base
Test: out/host/linux-x86/nativetest64/libaapt_tests/libaapt_tests
Test: out/host/linux-x86/nativetest64/libsplit-select_tests/libsplit-select_tests
Change-Id: I93cf24d4b232353a52d53be8ed85781b8f4a3877